cosign

cosign is the project of Belfast based artist and producer Martha Greer, crafting immersive indie-electronic music that explores the intersection of emotion and innovation. cosign’s debut EP ‘Remember When It’s Over’ was released in November 2025 co-produced with Chris W. Ryan (NewDad, Just Mustard, Chalk,). It sparked an immediate response, with single “Limbo” earning spots on Spotify editorial playlists and “Boyhood” being crowned Track of the Year by Genuine Irish.

cosign emerged from Martha’s creative claustrophobia. After years of piano lessons and early teenage years spent teaching herself guitar, she started to merge older acoustic resonance with her family’s laptop and a MIDI keyboard. Drawn to experimental production and lyrical depth, her sound fuses pulsing energy with introspective melancholy layered with arps, vocoders and rich harmonies.